A study of the doping dependence of Tc in Ba1- xKxFe2As2 and Sr1- xKxFe2As2 films grown by molecular beam epitaxy

T. Yamagishi, S. Ueda, S. Takeda, S. Takano, Akihiro Mitsuda, M. Naito

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Single-crystalline films of superconducting Ba1- xKxFe2As2 and Sr1- xKxFe2As2 were grown at temperatures below 350 °C under reduced As flux by molecular beam epitaxy. We performed a systematic study of the doping dependence of Tc in Ba 1-xKxFe2As2 for x = 0.0 to 1.0 and Sr1-xKxFe2As2 for x = 0.0 to 0.5. The highest Tcon (Tcend) so far attained is 38.3 K (35.5 K) at x ∼ 0.3 for Ba1-xKxFe2As 2, and 33.4 K (31.0 K) at x ∼ 0.4 for Sr1- xKxFe2As2. The optimum K-doping level inducing the highest Tc is different in the two systems. The implication of the results is briefly discussed.

Original languageEnglish
Pages (from-to)1177-1180
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume471
Issue number21-22
DOIs
Publication statusPublished - Nov 1 2011

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Molecular beam epitaxy
molecular beam epitaxy
Doping (additives)
Fluxes
Crystalline materials
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

A study of the doping dependence of Tc in Ba1- xKxFe2As2 and Sr1- xKxFe2As2 films grown by molecular beam epitaxy. / Yamagishi, T.; Ueda, S.; Takeda, S.; Takano, S.; Mitsuda, Akihiro; Naito, M.

In: Physica C: Superconductivity and its applications, Vol. 471, No. 21-22, 01.11.2011, p. 1177-1180.

Research output: Contribution to journalArticle

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AU - Yamagishi, T.

AU - Ueda, S.

AU - Takeda, S.

AU - Takano, S.

AU - Mitsuda, Akihiro

AU - Naito, M.

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N2 - Single-crystalline films of superconducting Ba1- xKxFe2As2 and Sr1- xKxFe2As2 were grown at temperatures below 350 °C under reduced As flux by molecular beam epitaxy. We performed a systematic study of the doping dependence of Tc in Ba 1-xKxFe2As2 for x = 0.0 to 1.0 and Sr1-xKxFe2As2 for x = 0.0 to 0.5. The highest Tcon (Tcend) so far attained is 38.3 K (35.5 K) at x ∼ 0.3 for Ba1-xKxFe2As 2, and 33.4 K (31.0 K) at x ∼ 0.4 for Sr1- xKxFe2As2. The optimum K-doping level inducing the highest Tc is different in the two systems. The implication of the results is briefly discussed.

AB - Single-crystalline films of superconducting Ba1- xKxFe2As2 and Sr1- xKxFe2As2 were grown at temperatures below 350 °C under reduced As flux by molecular beam epitaxy. We performed a systematic study of the doping dependence of Tc in Ba 1-xKxFe2As2 for x = 0.0 to 1.0 and Sr1-xKxFe2As2 for x = 0.0 to 0.5. The highest Tcon (Tcend) so far attained is 38.3 K (35.5 K) at x ∼ 0.3 for Ba1-xKxFe2As 2, and 33.4 K (31.0 K) at x ∼ 0.4 for Sr1- xKxFe2As2. The optimum K-doping level inducing the highest Tc is different in the two systems. The implication of the results is briefly discussed.

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